Summary: Ref T13513. Replaces "DifferentialInlineCommentQuery" with the similar but more modern "DifferentialDiffInlineCommentQuery".
Test Plan: Viewed comments in timeline, changesets. Created, edited, and submitted comments. Hid and un-hid comments, reloading (saw state preserved).
Maniphest Tasks: T13513
Differential Revision: https://secure.phabricator.com/D21233
Summary:
Ref T13513. Currently, inline storage objects ("TransactionComment") can't directly generate a runtime object ("InlineComment").
Allow this transformation to be performed in a genric way so clunky code which does it per-object-type can be removed, lifted, or simplified.
Simplify an especially gross callsite in preview code.
Test Plan: Previewed inline comments.
Maniphest Tasks: T13513
Differential Revision: https://secure.phabricator.com/D21226
Summary: Ref T13513. This controller was obsoleted by EditEngine and appears unreachable without explicitly typing the URL.
Test Plan:
- Grepped for the route, didn't find any hits.
- Deleted the controller, successfully previewed comments in Diffusion.
Maniphest Tasks: T13513
Differential Revision: https://secure.phabricator.com/D21224
Summary: Ref T13513. This slightly expands the existing-but-hacky "warning" workflow to cover both "mentions on draft" and "submitting inlines being edited".
Test Plan:
- Submitted changes to a revision with mentions on a draft, inlines being edited, both, and neither.
- Got sensible warnings in the cases where warnings were appropriate.
Maniphest Tasks: T13513
Differential Revision: https://secure.phabricator.com/D21191
Summary:
Ref T13513. This is mostly an infrastructure cleanup change.
In a perfect world, this would be a series of several changes, but they're tightly interconnected and don't have an obvious clean, nontrivial partition (or, at least, I don't see one). Followup changes will exercise this code repeatedly and all of these individual mutations are "obviously good", so I'm not too worried about the breadth of this change.
---
Inline comments are stored as transaction comments in the `PhabricatorAuditTransactionComment` and `DifferentialTransactionComment` classes.
On top of these two storage classes sit `PhabricatorAuditInlineComment` and `DifferentialInlineComment`. Historically, these were an indirection layer over significantly different storage classes, but nowadays both storage classes look pretty similar and most of the logic is actually the same. Prior to this change, these two classes were about 80% copy/pastes of one another.
Part of the reason they're so copy/pastey is that they implement a parent `Interface`. They are the only classes which implement this interface, and the interface does not provide any correctness guarantees (the storage objects are not actually constrained by it).
To simplify this:
- Make `PhabricatorInlineCommentInterface` an abstract base class instead.
- Lift as much code out of the `Audit` and `Differential` subclasses as possible.
- Delete methods which no longer have callers, or have only trivial callers.
---
Inline comments have two `View` rendering classes, `DetailView` and `EditView`. They share very little code.
Partly, this is because `EditView` does not take an `$inline` object. Historically, it needed to be able to operate on inlines that did not have an ID yet, and even further back in history this was probably just an outgrowth of a simple `<form />`.
These classes can be significantly simplified by passing an `$inline` to the `EditView`, instead of individually setting all the properties on the `View` itself. This allows the `DetailView` and `EditView` classes to share a lot of code.
The `EditView` can not fully render its content. Move the content rendering code into the view.
---
Prior to this change, some operations need to work on inlines that don't have an inline ID yet (we assign an ID the first time you "Save" a comment). Since "editing" comments will now be saved, we can instead create a row immediately.
This means that all the inline code can always rely on having a valid ID to work with, even if that ID corresponds to an empty, draft, "isEditing" comment. This simplifies more code in `EditView` and allows the "create" and "reply" code to be merged in `PhabricatorInlineCommentController`.
---
Client-side inline events are currently handled through a mixture of `ChangesetList` listeners (good) and ad-hoc row-level listeners (less good). In particular, the "save", "cancel", and "undo" events are row-level. All other events are list-level.
Move all events to list-level. This is supported by all inlines now having an ID at all stages of their lifecycle.
This allows some of the client behavior to be simplified. It currently depends on binding complex ad-hoc dictionaries into event handlers in `_drawRows()`, but it seems like almost all of this code can be removed. In fact, no more than one row ever seems to be drawn, so this code can probably be simplified further.
---
Finally, save an "isEditing" state. When we rebuild a revision on the client, click the "edit" button if it's in this state. This is a little hacky, but simpler to get into a stable state, since the row layout of an inline depends on a "view row" followed by an "edit row".
Test Plan:
- Created comments on either side of a diff.
- Edited a comment, reloaded, saw edit stick.
- Saved comments, reloaded, saw save stick.
- Edited a comment, typed text, cancelled, "unedited" to get state back.
- Created a comment, typed text, cancelled, "unedited" to get state back.
- Deleted a comment, "undeleted" to get state back.
Weirdness / known issues:
- Drafts don't autosave yet.
- Fixed in D21187:
- When you create an empty comment then reload, you get an empty editor. This is a bit silly.
- "Cancel" does not save state, but should, once drafts autosave.
- Mostly fixed in D21188:
- "Editing" comments aren't handled specially by the overall submission flow.
- "Editing" comments submitted in that state try to edit themselves again on load, which doesn't work.
Subscribers: jmeador
Maniphest Tasks: T13513
Differential Revision: https://secure.phabricator.com/D21186
Summary:
See PHI1719. User agents making hard-coded requests to "/favicon.ico" currently 404. This is a mild source of log noise, and we can reasonably route this request.
Limitations:
- This only routes the "PlatformSite". Other sites (custom Phame blogs, third-party sites, Phurl redirectors) won't route here for now.
- This returns a "Location:" redirect to the correct resource rather than icon data directly. This produces the right icon with the right caching behavior, and returning icon data directly is difficult in the general case. However, it won't perform/cache as well as a direct response would.
Test Plan:
- Visted `/favicon.ico`.
- Before: 404.
- After: redirect to favicon.
Differential Revision: https://secure.phabricator.com/D21195
Summary:
Ref T13455. Viewstates are fairly small and will probably grow less quickly than the changeset table, but the data is also not important to retain in the long term: if you revisit a change several months after hiding some files, it's fine if we've forgotten that you adjusted the view parameters.
Add a GC with a long default collection policy (180 days) so installs can manage the size of this table if it becomes necessary.
Test Plan: Ran via `bin/garbage` to adjust the GC policy and collect viewstates.
Maniphest Tasks: T13455
Differential Revision: https://secure.phabricator.com/D21164
Summary:
Ref T13516. Deletes all old filetree / flex / active / collapse nav code in favor of the new code.
Restores the inline tips in the path tree.
Test Plan: {F7374175}
Maniphest Tasks: T13516
Differential Revision: https://secure.phabricator.com/D21154
Summary: Ref T13516. This glues "FormationView" to "ChangesetList". The actual tree is not functional in any meaningful way yet.
Test Plan: {F7373838}
Maniphest Tasks: T13516
Differential Revision: https://secure.phabricator.com/D21151
Summary:
Ref T13516. Currently, the "File Tree" element is a semi-dynamic side panel that's implemented as a special mode of a side nav panel.
This implementation is fairly clunky, and arose from organic growth out of the side nav. As such, it has some weird behaviors, doesn't have builtin support for show/hide, and can't generalize easily.
Introduce a "FormationView" which supports loading a page up with piles of side panels in various modes.
Test Plan: No callers and no user-visible impact.
Maniphest Tasks: T13516
Differential Revision: https://secure.phabricator.com/D21150
Summary:
Ref T13515. Settings currently has some highly specialized code for rendering "Changes saved." messages. The "saved" state is communicated across a redirect-after-POST by adding `/saved/` to the end of the URI.
This isn't great. It needs a lot of moving pieces, including special accommodations in routing rules. It's user-visible. It has the wrong behavior if you reload the page or navigate directly to the "saved" URI.
Try this scheme, which is also pretty sketchy but seems like an upgrade on the balance:
- Set a cookie on the redirect which identifies the form we just saved.
- On page startup: if this cookie exists, save the value and clear it.
- If the current page started with a cookie identifying the form on the page, treat the page as a "saved" page.
This supports passing a small amount of state across the redirect-after-POST flow, and when you reload the page it doesn't keep the message around. Applications don't need to coordinate it, either. Seems somewhat cleaner?
Test Plan: In Firefox, Safari, and Chrome: saved settings, saw a "Saved changes" banner without any URI junk. Reloaded page, saw banner vanish properly.
Maniphest Tasks: T13515
Differential Revision: https://secure.phabricator.com/D21144
Summary:
Ref T13515. Currently, opening a file to a particular line in an external editor relies on replacing "%l" with "%l" (which is escaped as "%25l") on the server, and then replacing "%25l" with the line number on the client. This will fail if the file path (or any other variable) contains "%l" in its unencoded form.
The parser also can't identify invalid variables.
Pull the parser out, formalize it, and make it generate an intermediate representation which can be sent to the client and reconstituted.
(This temporarily breaks Diffusion and permanently removes the weird, ancient integration in Dark Console.)
Test Plan:
- Added a bunch of tests for the actual parser.
- Used "Open in Editor" in Differential.
Maniphest Tasks: T13515
Differential Revision: https://secure.phabricator.com/D21143
Summary: Ref T13515. No callsites actually use this, most editors don't support it, it doesn't seem terribly useful for the ones that do, it makes template-based APIs for line-number substitution complicated, and we can probably just loop on `window.open()` anyway.
Test Plan: Grepped for affected symbols, found no more references. Loaded settings page, saw no more setting.
Maniphest Tasks: T13515
Differential Revision: https://secure.phabricator.com/D21142
Summary:
Ref T13515. It's not intuitive that these settings are "Display Preferences", even thought they're intenrally related to some of the other display preferences.
Give them a separate group.
Test Plan: {F7370500}
Maniphest Tasks: T13515
Differential Revision: https://secure.phabricator.com/D21140
Summary:
Ref T13455. Add container-level storage for persistent view state, and persist "Highlight As..." inside it.
The storage generates a "PhabricatorChangesetViewState" configuration object as an output.
When preferences are expressed on a diff and that diff is later attached to a revision, we attempt to copy the preferences.
The internal storage tracks per-changeset settings, but currently always uses "last update wins" to apply the settings in the UI.
Test Plan:
- Viewed revisions, changed highlighting, reloaded. Saw highlighting stick in revision view and standalone view.
- Viewed commits, changed highlighting, reloaded. Saw highlighting stick.
- Created a diff, changed highlighting, turned it into a revision, saw highlighting persist.
Subscribers: jmeador, PHID-OPKG-gm6ozazyms6q6i22gyam
Maniphest Tasks: T13455
Differential Revision: https://secure.phabricator.com/D21137
Summary:
Ref PHI1292. Enable fulltext searchs in paste. Maybe this should only index a snippet instead of the entire content?
Also updates table names in `PhabricatorPasteQuery`.
Test Plan: Created some pastes, indexed them, searched for them.
Reviewers: amckinley
Subscribers: codeblock, Korvin, PHID-OPKG-gm6ozazyms6q6i22gyam
Differential Revision: https://secure.phabricator.com/D20650
Summary: Ref T13511. Currently, Ferret fulltext field functions (like "title:") are hard-coded. Modularize them so extensions may define new ones.
Test Plan: Added a new custom field which emits data for the indexer, searched for "animal-noises:moo", "animal-noises:-", etc., in global search and application search.
Maniphest Tasks: T13511
Differential Revision: https://secure.phabricator.com/D21131
Summary:
Ref T13501. Depends on D21127. With the "prefix" behavior removed in D21127, we now have two virtually identical copies of the same code.
The newer one in Ferret is better: it slices utf8 correctly and is slightly more efficient on large inputs. Pull it out and make all callers call into it.
Test Plan:
- Grepped for all affected symbols.
- Ran `bin/search index --force ...` to reindex various objects (tasks, files).
- Searched for things in the UI.
Maniphest Tasks: T13501
Differential Revision: https://secure.phabricator.com/D21128
Summary: Depends on D21014. Ref T13493. Make these objects all use destructible interfaces and destroy sub-objects appropriately.
Test Plan:
- Used `bin/remove destroy --trace ...` to destroy a provider, a user, and an external account.
- Observed destruction of sub-objects, including external account identifiers.
Maniphest Tasks: T13493
Differential Revision: https://secure.phabricator.com/D21015
Summary:
Depends on D21010. Ref T13493. External accounts may have multiple different unique identifiers, most often when v1 of the API makes a questionable choice (and provies a mutable, non-unique, or PII identifier) and v2 of the API uses an immutable, unique, random identifier.
Allow Phabricator to store multiple identifiers per external account.
Test Plan: Storage only, see followup changes.
Subscribers: PHID-OPKG-gm6ozazyms6q6i22gyam
Maniphest Tasks: T13493
Differential Revision: https://secure.phabricator.com/D21011
Summary: Ref T13395. Moves a small amount of remaining "libphutil/" code into "phabricator/" and stops us from loading "libphutil/".
Test Plan: Browsed around; there are likely remaining issues.
Maniphest Tasks: T13395
Differential Revision: https://secure.phabricator.com/D20981
Summary: Ref T13395. Move cache classes, syntax highlighters, other markup classes, and sprite sheets to Phabricator.
Test Plan: Attempted to find any callers for any of this stuff in libphutil or Arcanist and couldn't.
Maniphest Tasks: T13395
Differential Revision: https://secure.phabricator.com/D20977
Summary: Ref T13395. Moves some Aphront classes from libphutil to Phabricator.
Test Plan: Grepped for symbols in libphutil and Arcanist.
Maniphest Tasks: T13395
Differential Revision: https://secure.phabricator.com/D20975
Summary:
Depends on D20966. Ref T13486. Curtains currently render subscribers in a plain text list, but the new ref list element is a good fit for this.
Also, improve the sorting and ordering behavior.
This makes the subscriber list take up a bit more space, but it should make it a lot easier to read at a glance.
Test Plan: Viewed object subscriber lists at varying limits and subscriber counts, saw sensible subscriber lists.
Maniphest Tasks: T13486
Differential Revision: https://secure.phabricator.com/D20967
Summary:
Ref T13486. When a curtain element like "Author" in Maniphest has a very long username, the wrapping and overflow behavior is poor: the date is obscured.
Adjust curtain elements which contain lists of references to other objects to improve wrapping behavior (put the date on a separate line) and overflow behavior (so we get a "..." when a name overflows).
Test Plan: {F7179376}
Maniphest Tasks: T13486
Differential Revision: https://secure.phabricator.com/D20966
Summary:
Depends on D20933. Ref T13362. This reorganizes Config a bit and attempts to simplify it.
Subsections are now in a landing page console and groupings have been removed. We "only" have 75 values you can edit from the web UI nowadays, which is still a lot, but less overwhelming than it was in the past. And the trend is generally downward, as config is removed/simplified or moved into application settings.
This also gets rid of the "gigantic blobs of JSON in the UI".
Test Plan: Browsed all Config sections.
Maniphest Tasks: T13362
Differential Revision: https://secure.phabricator.com/D20934
Summary: Depends on D20931. Ref T13362. Move all "Console"-style interfaces to use a consistent layout based on a new "LauncherView" which just centers the content.
Test Plan: Viewed all affected interfaces.
Subscribers: PHID-OPKG-gm6ozazyms6q6i22gyam
Maniphest Tasks: T13362
Differential Revision: https://secure.phabricator.com/D20933
Summary: Depends on D20930. Ref T13362. Put all the "Services" parts of Config in their own section.
Test Plan: Clicked through each section. This is just an organization / UI change with no significant behavioral impact.
Maniphest Tasks: T13362
Differential Revision: https://secure.phabricator.com/D20931
Summary: Fixes T13480. Adds the remaining missing Owners package rules for Herald commit adapters.
Test Plan: Created hooks which care about these fields, pushed commits, saw sensible transcript values.
Maniphest Tasks: T13480
Differential Revision: https://secure.phabricator.com/D20957
Summary:
Ref T13480. Currently, some Herald field types are rendered in an unfriendly way on transcripts. Particularly, PHID lists are rendered as raw PHIDs.
Improve this by delegating rendering to Value objects and letting "PHID List" value objects render more sensible handle lists. Also improve "bool" fields a bit and make more fields render an explicit "None" / empty value rather than just rendering nothing.
Test Plan: Viewed various transcripts, including transcripts covering boolean values, the "Always" condition, large blocks of text, and PHID lists.
Maniphest Tasks: T13480
Differential Revision: https://secure.phabricator.com/D20951
Summary: Ref T13480. Add an "Author's packages" field to Herald to support writing rules like "if affected packages include X, and author's packages do not include X, raise the alarm".
Test Plan: Wrote and executed rules with the field, saw a sensible field value in the transcript.
Maniphest Tasks: T13480
Differential Revision: https://secure.phabricator.com/D20947
Summary: Ref T13480. These fields don't serve a specific strong use case, but are broadly reasonable capabilities after "state" vs "change" actions were relaxed by T13283.
Test Plan: Wrote rules using the new fields, added and removed projects (and did neither) to fire them / not fire them. Inspected the transcripts to see the project PHIDs making it to the field values.
Maniphest Tasks: T13480
Differential Revision: https://secure.phabricator.com/D20946
Summary: Ref T13472. Ref T13395. These classes are only used by Phabricator and not likely to find much use in Arcanist.
Test Plan: Grepped libphutil and Arcanist for removed symbols.
Maniphest Tasks: T13472, T13395
Differential Revision: https://secure.phabricator.com/D20939
Summary:
See PHI1558. Ref T11860. Ref T13444. I partly implemented PHIDs for "UserEmail" objects, but they can't load on their own so you can't directly `bin/remove destroy` them yet.
Allow them to actually load by implementing "PolicyInterface".
Addresses are viewable and editable by the associated user, unless they are a bot/list address, in which case they are viewable and editable by administrators (in preparation for T11860). This has no real impact on anything today.
Test Plan:
- Used `bin/remove destroy <phid>` to destroy an individual email address.
- Before: error while loading the object by PHID in the query policy layer.
- After: clean load and destroy.
Maniphest Tasks: T13444, T11860
Differential Revision: https://secure.phabricator.com/D20927
Summary:
Ref T13444. Currently, many mutations to users and email addresses (particularly: user creation; and user and address destruction) do not propagate properly to repository identities.
Add hooks to all mutation workflows so repository identities get rebuilt properly when users are created, email addresses are removed, users or email addresses are destroyed, or email addresses are reassigned.
Test Plan:
- Added random email address to account, removed it.
- Added unassociated email address to account, saw identity update (and associate).
- Removed it, saw identity update (and disassociate).
- Registered an account with an unassociated email address, saw identity update (and associate).
- Destroyed the account, saw identity update (and disassociate).
- Added address X to account A, unverified.
- Invited address X.
- Clicked invite link as account B.
- Confirmed desire to steal address.
- Saw identity update and reassociate.
Maniphest Tasks: T13444
Differential Revision: https://secure.phabricator.com/D20914
Summary:
Ref T13444. To interact meaningfully with "DestructionEngine", objects need a PHID. The "UserEmail" object currently does not have one (or a real "Query").
Provide basic PHID support so "DestructionEngine" can interact with the object more powerfully.
Test Plan:
- Ran migrations, checked data in database, saw sensible PHIDs assigned.
- Added a new email address to my account, saw it get a PHID.
Subscribers: PHID-OPKG-gm6ozazyms6q6i22gyam
Maniphest Tasks: T13444
Differential Revision: https://secure.phabricator.com/D20913
Summary: Ref T13444. Prepare to hook identity updates when user email addreses are destroyed.
Test Plan:
- Destroyed a user with `bin/remove destroy ... --trace`, saw email deleted.
- Destroyed an email from the web UI, saw email deleted.
Maniphest Tasks: T13444
Differential Revision: https://secure.phabricator.com/D20912
Summary: Ref T13444. Send all repository identity/detection through a new "DiffusionRepositoryIdentityEngine" which handles resolution and detection updates in one place.
Test Plan:
- Ran `bin/repository reparse --message ...`, saw author/committer identity updates.
- Added "goose@example.com" to my email addresses, ran daemons, saw the identity relationship get picked up.
- Ran `bin/repository rebuild-identities ...`, saw sensible rebuilds.
Maniphest Tasks: T13444
Differential Revision: https://secure.phabricator.com/D20910
Summary:
Fixes T13461. Some applications provide hints about policy strength in the header, but these hints are inconsistent and somewhat confusing. They don't make much sense for modern objects with Custom Forms, which don't have a single "default" policy.
Remove this feature since it seems to be confusing things more than illuminating them.
Test Plan:
- Viewed various objects, no longer saw colored policy hints.
- Grepped for all removed symbols.
Maniphest Tasks: T13461
Differential Revision: https://secure.phabricator.com/D20918
Summary:
Ref T13454. Fixes T13006. When a user provide us with an SSH private key and (possibly) a passphrase:
# Try to verify that they're correct by extracting the public key.
# If that fails, try to figure out why it didn't work.
Our success in step (2) will vary depending on what the problem is, and we may end up falling through to a very generic error, but the outcome should generally be better than the old approach.
Previously, we had a very unsophisticated test for the text "ENCRYPTED" in the key body and questionable handling of the results: for example, providing a passphrase when a key did not require one did not raise an error.
Test Plan:
Created and edited credentials with:
- Valid, passphrase-free keys.
- Valid, passphrased keys with the right passphrase.
- Valid, passphrase-free keys with a passphrase ("surplus passphrase" error).
- Valid, passphrased keys with no passphrase ("missing passphrase" error).
- Valid, passphrased keys with an invalid passphrase ("invalid passphrase" error).
- Invalid keys ("format" error).
The precision of these errors will vary depending on how helpful "ssh-keygen" is.
Maniphest Tasks: T13454, T13006
Differential Revision: https://secure.phabricator.com/D20905
Summary:
Ref T13442. Ref T13157. There's a secret URI to look at an object's hovercard in a standalone view, but it's hard to remember and impossible to discover.
In developer mode, add an action to "View Hovercard". Also add "View Handle", which primarily shows the object PHID.
Test Plan: Viewed some objects, saw "Advanced/Developer...". Used "View Hovercard" to view hovercards and "View Handle" to view handles.
Maniphest Tasks: T13442, T13157
Differential Revision: https://secure.phabricator.com/D20887
Summary:
Fixes T13441. Internally, projects can be queried by depth, but this is not exposed in the UI.
Add a "Is root project?" contraint in the UI, and "minDepth" / "maxDepth" constraints to the API.
Test Plan:
- Used the UI to query root projects, got only root projects back.
- Used "project.search" in the API to query combinations of root projects and projects at particular depths, got matching results.
Maniphest Tasks: T13441
Differential Revision: https://secure.phabricator.com/D20886
Summary: Ref T13438. This is a sort of minimal plausible implementation.
Test Plan: Used "harbormaster.artifact.search" to query information about artifacts.
Subscribers: PHID-OPKG-gm6ozazyms6q6i22gyam
Maniphest Tasks: T13438
Differential Revision: https://secure.phabricator.com/D20878
Summary: Fixes T13430. Provide more information about repositories in "diffusion.repository.search".
Test Plan: Used API console to call method (with new "metrics" attachment), reviewed output. Saw new fields returned.
Maniphest Tasks: T13430
Differential Revision: https://secure.phabricator.com/D20862
Summary:
Ref T13429. It's currently possible to write "TYPE_EDGE" relationships for the "object has project" edge to PHIDs which may not actually be projects. Today, this fatals.
As a first step, unfatal it. T13429 discusses general improvements and greater context.
Test Plan:
Used "maniphest.edit" to write a "project" edge to a user PHID, viewed the task in the UI. Previously it fataled; now it renders unusually (the object is "tagged" with a user) but faithfully reflects database state.
{F6957606}
Maniphest Tasks: T13429
Differential Revision: https://secure.phabricator.com/D20860
Summary:
Depends on D20844. Ref T13425. When we line up two blocks and they can be interdiffed (generally: they both have the same type of content), let the Engine interdiff them.
Then, make the Jupyter engine interdiff markdown.
Test Plan: {F6898583}
Maniphest Tasks: T13425
Differential Revision: https://secure.phabricator.com/D20845
Summary: Depends on D20838. Fixes T13414. Instead of doing coarse diffing with "PhutilEditDistanceMatrix", use hash-and-diff with "DocumentEngine".
Test Plan:
- On a large document (~3K top level blocks), saw a more sensible diff, instead of the whole thing falling back to "everything changed" mode.
- On a small document, still saw a sensible granular diff.
{F6888249}
Maniphest Tasks: T13414
Differential Revision: https://secure.phabricator.com/D20839
Summary: Depends on D20836. Ref T13414. Ref T13425. Ref T13395. Move these to "phabricator/" before trying to improve the high-level diff engine in prose diffs.
Test Plan: Ran "arc liberate", looked at a prose diff (no behavioral change).
Maniphest Tasks: T13425, T13414, T13395
Differential Revision: https://secure.phabricator.com/D20838
Summary:
Depends on D20831. Ref T13425. As an escape hatch to get out of future DocumentEngine rendering behavior, provide a "View As.." option.
Now I can break DocumentEngine real bad and no one can complain.
Test Plan: Used "View As" to swap document engines for image files.
Maniphest Tasks: T13425
Differential Revision: https://secure.phabricator.com/D20832
